TheBackShed.com

Forum Index : Microcontroller and PC projects : If you haven't got a CMM2 Gen2 then perhaps you want one ;-)

Page 2 of 2

Author

Message

Volhout

Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 6252

Posted: 10:44am 05 Nov 2026

Copy link to clipboard

Print this post

Hi Wolfi,

CMM2 (G1/G2) is VGA only. At this moment there is no CMM2 with HDMI.
Having said that, miracles can happen at any time, who knows when Peter will surprise us with a CMM2+ that features HDMI.

Volhout

PicomiteVGA PETSCII ROBOTS

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 12172

Posted: 11:07am 05 Nov 2026

Copy link to clipboard

Print this post

The stm32H743 can't support HDMI. The only solution is a RGB to HDMI converter on board such as the MS7210. This would do away with the resistor network and convert the digital RGB888 colour signals direct to hdmi. I'm toying with getting some built but the two-off costs are quite high
Edited 2026-11-05 21:08 by matherp

Wölfi

Regular Member

Joined: 14/10/2026
Location: Germany
Posts: 44

Posted: 11:26am 05 Nov 2026

Copy link to clipboard

Print this post

Thanks, guys!

If I understand correctly, there wouldn’t be any technical advantage, it would simply be a matter of matching the output to the monitor, rather than getting different or better resolutions.

So, for me, it comes down to which monitor I use and what should be the general standard. Right?

Mixtel90

Guru

Joined: 05/10/2019
Location: United Kingdom
Posts: 9328

Posted: 12:00pm 05 Nov 2026

Copy link to clipboard

Print this post

I would imagine that, in spite of the CMM2 having a more powerful processor, some of that power would be lost in handling HDMI as it is a single CPU and has no HSTX? The MS7210 wants parallel digital input (I doubt if the CMM2 processor will give IIS or SP/DIF), which once again is a high speed digital port. It has the advantage of faster RAM though.

It might be more of an equalizer to the RP2350. lol

Mick

Zilog Inside! nascom.info for Nascom & Gemini

vegipete

Guru

Joined: 29/01/2013
Location: Canada
Posts: 1193

Posted: 05:43pm 05 Nov 2026

Copy link to clipboard

Print this post

The MS7210 looks like an interesting & cheap chip. Thanks for that part number. I might get some to play with - just need to find a legible English data sheet.

A video transmitter chip like this does the job of an external VGA-to-HDMI converter, perhaps slightly better because there is no conversion to/from analog. 24 bits of colour data, hsync, vsync and pixel clock are already coming out of the STM32 chip. There'd be a bit of I2C to set the MS7210 up, and ideally some I2S stuff to include audio.

Visit Vegipete's *Mite Library for cool programs.

matherp
Guru

Joined: 11/12/2012
Location: United Kingdom
Posts: 12172

Posted: 06:06pm 05 Nov 2026

Copy link to clipboard

Print this post

I've done a design if you want to play with it

CMM2G2V3_MS7210_full.zip

vegipete

Guru

Joined: 29/01/2013
Location: Canada
Posts: 1193

Posted: 04:31pm 06 Nov 2026

Copy link to clipboard

Print this post

Hmmm, I haven't yet figured out what to do with a *.eprj2 file. EasyEDA Standard? Pro?

Visit Vegipete's *Mite Library for cool programs.

Volhout

Guru

Joined: 05/03/2018
Location: Netherlands
Posts: 6252

Posted: 04:38pm 06 Nov 2026

Copy link to clipboard

Print this post

Suggestion….

Wait for CcMM2V3

Volhout

PicomiteVGA PETSCII ROBOTS

Page 2 of 2

Print this page

To reply to this topic, you need to log in.